is it possible to customize the ringtone for a Contact Group? I tried but nothing... on my 8310.

also, I do not understand what is going with my 8310. I've set up the Custom Tune for several contact. everything was fine till I've change the Phone Profile from Normal to Quiest. Also I had some Excepted Calls set-up. Now after I put again the normal profile and unchecked the Exceptions the Custom Tunes doest work. All the Contact have the same ring tone.